Tube-Super Dielectric Materials: Electrostatic Capacitors with Energy Density Greater than 200 J·cm−3

Materials

Francisco Javier Quintero Cortes²  Jonathan Phillips¹ 

[1] Physics Department, Naval Postgraduate School, Monterey, CA 93943, USA;Universidad Nacional de Colombia, Bogotá 111321, Colombia; E-Mail:

关键词: energy storage;    capacitor;    dielectric materials;    titania nanotube arrays;   

DOI  :  10.3390/ma8095301

来源: mdpi

【 摘 要 】

The construction and performance of a second generation of super dielectric material based electrostatic capacitors (EC), with energy density greater than 200 J·cm⁻³, which rival the best reported energy density of electric double layer capacitors (EDLC), also known as supercapacitors, are reported. The first generation super dielectric materials (SDM) are multi-material mixtures with dielectric constants greater than 1.0 × 10⁵, composed of a porous, electrically insulating powder filled with a polarizable, ion-containing liquid. Second-generation SDMs (TSDM), introduced here, are anodic titania nanotube arrays filled with concentrated aqueous salt solutions. Capacitors using TiO₂ based TSDM were found to have dielectric constants at ~0 Hz greater than 10⁷ in all cases, a maximum operating voltage of greater than 2 volts and remarkable energy density that surpasses the highest previously reported for EC capacitors by approximately one order of magnitude. A simple model based on the classic ponderable media model was shown to be largely consistent with data from nine EC type capacitors employing TSDM.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.